* contrib/lisp/org-export.el (org-export-get-footnote-definition):
Provide a fallback definition when none can be found.
* contrib/lisp/org-e-latex.el (org-e-latex-footnote-reference): Revert
change made in 30ef385ee03ea1f92e07f368413c065630bc01b8 since it is
now handled at the export framework level.
* testing/lisp/test-org-export.el: Add test.